Add Watermark on Images In Python Using OpenCV

by ahin subhra das

I add Watermarked as : Ahin photography in my select image

The goal of watermarking is to create a unique and identifiable pattern on the image, giving attribution to the original creator, but without destroying the contents of the image itself.

In this article we are create watermark on our selected image . For that firstly we need to import OpenCV libraries and python libraries . After that we need to read original image or selected image with img.read() . Then we create a blank image to draw watermark and then we just need to blending two images . After blend we get the final result as a new image which contains watermark with specific text .

Code :

import cv2
import numpy as np
import matplotlib.pyplot as plt

#read the original image
img1 = cv2.imread(‘D:\\create_watermark\\reflexs.jpg’)
img_rgb = cv2.cvtColor(img1, cv2.COLOR_BGR2RGB)

#ploting rgb of original image
plt.imshow(img_rgb);
print(‘image dtype ‘,img_rgb.dtype)

#create a blank image
blank_img = np.zeros(shape=(img_rgb.shape[0],img_rgb.shape[1],3), dtype=np.uint8)

# cv2.FONT_HERSHEY_SIMPLEX denoted the font type
font = cv2.FONT_HERSHEY_SIMPLEX

#cv2.putText() method is used to draw a text string on any image.
#cv2.putText(image, text, org, font, fontScale, color[, thickness[, lineType[, bottomLeftOrigin]]])

cv2.putText(blank_img,
text=’Ahin photography’,
org=(img_rgb.shape[1]//8, img_rgb.shape[0]//2),
fontFace=font,
fontScale= 2,color=(255,0,0),
thickness=10,
lineType=cv2.LINE_4)

plt.imshow(blank_img);

# blend two images original image is made a little light and watermark dark
blended = cv2.addWeighted(src1=img_rgb,alpha=0.7,src2=blank_img,beta=1, gamma = 0)
plt.imshow(blended);

#draw new image to our directory
cv2.imwrite(‘new_watermarked.jpg’, cv2.cvtColor(blended, cv2.COLOR_RGB2BGR))

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